January weather forecast
Plymouth, IL

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Weather in January

January, the same as December, in Plymouth, Illinois, is a freezing cold winter month, with an average temperature fluctuating between 31.1°F (-0.5°C) and 19°F (-7.2°C).

Temperature

January is the coldest month of the year, registering average temperatures as high as 31.1°F (-0.5°C) and as low as 19°F (-7.2°C).

Humidity

The average relative humidity in January is 80%.

Rainfall

In Plymouth, in January, during 3.3 rainfall days, 0.39" (10mm) of precipitation is typically accumulated. In Plymouth, during the entire year, the rain falls for 94.4 days and collects up to 7.76" (197mm) of precipitation.

Snowfall

Months with snowfall are January through April, October through December. January is the month with the most snowfall. Snow falls for 6.3 days and accumulates 0.67" (17mm) of snow.

Daylight

In January, the average length of the day is 9h and 41min.
On the first day of the month, sunrise is at 7:26 am and sunset at 4:47 pm. On the last day of January, sunrise is at 7:13 am and sunset at 5:20 pm CST.

Sunshine

The month with the least sunshine is January, with an average of 4.1h of sunshine.

UV index

January is the month with the lowest UV index, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: The daily high UV index of 1 in January translates into this advice:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.

Frequently asked questions

What is the coldest time of year?

The lowest temperatures are recorded in January, with averages reaching a high of 31.1°F (-0.5°C) and a low of 19°F (-7.2°C).

How cold is January?

The average high-temperature, in January, in Plymouth, is 31.1°F (-0.5°C), while the average low-temperature is 19°F (-7.2°C).

What is the average humidity in January?

The average relative humidity in January is 80%.

How many days does it rain in January?

In Plymouth, in January, it is raining for 3.3 days, with typically 0.39" (10mm) of accumulated precipitation.

What is the snowiest month?

January is the month with the most snowfall in Plymouth. Snow falls for 6.3 days and accumulates 0.67" (17mm) of snow.

How many days does it snow in January?

In Plymouth, in January, during 6.3 snowfall days, 0.67" (17mm) of snow is typically accumulated.

How many hours of daylight does Plymouth have in January?

The average day length in January is 9h and 41min.

When are sunrise and sunset in January?

In January, on the first day of the month, sunrise is at 7:26 am and sunset at 4:47 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 5:20 pm CST.

What is the month with the least sunshine?

January has the least sunshine of the year, with an average of 4.1h of sunshine.

How many hours of sunshine does Plymouth have in January?

In January, the average sunshine duration is 4.1h.

When is the lowest UV index in Plymouth?

The month with the lowest UV index is January, with an average maximum UV index of 1.

How high is the UV index in January in Plymouth?

In January, the average daily maximum UV index is 1. A UV Index value of 2, and less, symbolizes a low health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Plymouth, IL

Average temperature in January - Plymouth, IL
  • Average high temperature in January: 31.1°F

The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is January (31.1°F).

  • Average low temperature in January: 19°F

The month with the highest average low temperature is July (66.2°F).
The coldest month (with the lowest average low temperature) is January (19°F).

Average pressure in January
Plymouth, IL

Average pressure in January - Plymouth, IL
  • Average pressure in January: 30.15"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

Average wind speed in January
Plymouth, IL

Average wind speed in January - Plymouth, IL
  • Average wind speed in January: 10.5mph

The windiest month (with the highest average wind speed) is January (10.5mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).

Average humidity in January
Plymouth, IL

Average humidity in January - Plymouth, IL
  • Average humidity in January: 80%

The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).

Average rainfall in January
Plymouth, IL

Average rainfall in January - Plymouth, IL
  • Average rainfall in January: 0.39"

The wettest month (with the highest rainfall) is May (1.1").
The driest month (with the least rainfall) is December (0.35").

Average rainfall days in January
Plymouth, IL

Average rainfall days in January - Plymouth, IL
  • Average rainfall days in January: 3.3 days

The month with the highest number of rainy days is May (12.3 days).
The month with the least rainy days is January (3.3 days).

Average snowfall in January
Plymouth, IL

Average snowfall in January - Plymouth, IL
  • Average snowfall in January: 0.67"

The month with the highest snowfall is January (0.67").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in January
Plymouth, IL

Average snowfall days in January - Plymouth, IL
  • Average snowfall days in January: 6.3 days

The month with the highest number of snowfall days is January (6.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in January /
Average sunshine in January
Plymouth, IL

Average daylight in January / Average sunshine in January - Plymouth, IL
  • Average daylight in January: 9h and 4min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in January: 4h and 1min

The months with the most sunshine are June and July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).

Average sunshine days in January
Plymouth, IL

Average sunshine days in January - Plymouth, IL
  • Average sunshine days in January: 22.8 days

The month with the most sunshine days is December (23.5 days).
The month with the least sunshine days is June (13.9 days).

Average UV index in January
Plymouth, IL

Average UV index in January - Plymouth, IL
  • Average UV index in January: 1

The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).

Average cloud cover in January
Plymouth, IL

Average cloud cover in January - Plymouth, IL
  • Average cloud cover in January: 55

The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is August (Cloud cover 29).

Average visibility in January
Plymouth, IL

Average visibility in January - Plymouth, IL
  • Average visibility in January: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

Plymouth, Illinois, USA

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